Mitsubishi Electric MELSEC-Q Series User Manual page 303

Error code
Description
(hexadecimal)
B3A4 Parameter mismatch
Invalid mode
B3A5
(parameter)
B3F1 to B3F3 System error
Parameter setting
B401
change error
B404 Response error
B405 Transient request error
B407
System error
B409
Receive buffer size
B410
error
Data length outside the
B411
range
Station number outside
B412
the range
B413 Request error
Interlock signal data
B414
outside the range
Execution station type
B415
error
B416 to B418 System error
Error cause (details)
While the standby master station
was operating as a master
station by the master station
duplex function, the network
parameter setting of the faulty
master station was changed.
The mode set in the control data
of the G(P).RLPASET instruction
differs from that set using the
switch 3 of the intelligent function
module switch setting.

The parameter setting was
changed during transient
request.
A response is not received from
the request destination station
within the monitoring time.
A transient request was issued to
a remote I/O station or a remote
device station.
Or too many transient requests
were sent to the corresponding
station.

The receive buffer size of the
dedicated instruction is smaller
than the response data size.
The number of read/write points
in the control data of the
dedicated instruction is outside
the range.
The station number stored in the
control data of the dedicated
instruction is outside the range.
Multiple dedicated instructions
were executed to the same
station.
The value set to the interlock
signal storage device of the
G(P).RIRCV or G(P).RISEND
instruction is outside the range.
The dedicated instruction only for
the master station was executed
on a station other than the
master station.

CHAPTER 11 TROUBLESHOOTING
Corrective action
Undo the network parameter
setting of the master station.
Correct the control data or the
switch 3 setting.
Please consult your local
Mitsubishi representative.
Change the parameter after all
transient requests are completed
or before the request is issued.
Increase the monitoring time
value.
If the error persists, check the
modules and cables at the
destination.
Set a local station or an intelligent
device station as the target
station. Or wait for a while and
send the request again (overload
due to many transient requests).
Please consult your local
Mitsubishi representative.
Change the receive buffer size.
Change the number of points
within the range.
Change the station number within
the range.
Modify the program.
Set the device value within the
range.
Check if the host station type is a
master station.
Please consult your local
Mitsubishi representative.
Delectability
Master Local
station station
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